Scroll-sanding machine



E. F. BUTTS SCROLL SANDING MACHINE Filed dan. 25,/ .1925 g shgetsrsheerl INVENTOR E. F. [BUTTS s cRoLL SANDING MACHINE 2 Sheets-Sheet 2 I l`|NVENTOR Filed dan. 25

Patented Aug. 12, 1924.

UNITED: STATES@ seRoLn-'SANDING y-iviAcfHINn-f Applicatoniled January25,1 1923;: Serial Nd. A614,888:

` Be itiknown that I, EMIUF; BUT'rs51a citi-` zenru of fthe AnitedStates,` and a resident -of Tacoma,` r in i the county of rPierce,rState 'of Washington, have Iinvented certain new vand usefulvImprovements r in Scroll-Sanding Machines, .of which :thefollowings-isla speci-V fcation.

This inventiorrrelates to niracliinesfused :in theVI -xnanufacturef of'lfrn'iture, and kindred industries;y for the purpose of r f smoothingtli'evrough. surfdcei of'.` ciirved' and other spie,- cially shaped ormoldec'l wood'enfv pieces after they-have b'een'fbronghttotheldesiredzrough shape and #sizefA in the". other machinery.il

The obj ects .of the'finvention are toprovide a `machine".- which`willbrace'th'epi-ece-of wood.;V while'k it rv isbeing: manipulate'dfv tosl'no'oth' its:.varyingisurfaces'j to '.=i1rs1i^reftliat thesrnoothedsurface isnislred at 'the corq rectA anglewith!the-"adjacent" surface; 1to permit the part' 1 beiirgiesniootlied to @be swng into any positionAorder 'to lering` tlrevsnlr faceV into contact l with theA sanding?belt; toY perinit'ltlreZ-belt' toibe b'ent `inrorder to smooth specialkshapesgff which will 1greatly increase? the lspeed atwhichf thisworkfinay bedone; which -isfsiinplefto operate Y I attain' -tliese and?other* objectsfbylthe "devices nechanisrnsfand arrangements iillustratedn 'the Vaecompanyin'zg@. drawings; vin which@ Fig; 1 'isai? sideelevation of my\ miachine,` 'showing the outline Lof' apart ofthe 'top'railfof a' chair' back'f being "s1noothed thereby; Fig.= v2 is 'aifronti.y elevation `thereof showing the work brace board in verticalposition and; in'ldotted lines, in tippedposition to change the anglebetween'its'surfac'e an'd the" plane of'l the sandingI belt Fig. 3 is aplan thereof*;'jFig.L LLisa sectionlof'apart thereof', on tlde line4'-'4 in Fig3, vand Fig.

` 5 is a side elevation'ofthecomplete machine. Similar ndm'eralsv ofreference-i" refer to similar parts throughout-the severalI views. Thisinvention'fre'lates" to that class of smoothing machinesfwhicli use atraveling sand belt and isa specialforrh of'sanding table:

The base table `1jis suitably'l supported which are cut in itsvfrontlan'd -rear edges respectively. These notchesmay preferablyloeniade withslantingendsd and 5, respec- "tively, as shown inFigsi-land 3-and'are 9 to the' desired posit-ion., The vwork table' 9 `70iswsecured lto the said vblocks 16 by, means-lof two bolts *10, whoseheads are:- niounted l'in tl1e--cou1itersunkf slots 11 in therupper`vsurfaces;Y of lthe two 4blocks',y said: slotsl :11. -eX1- tendingfronifro'nt tofrearfof saidblo'cks 6'.

Thewnuts 12' off the bolts'jlO are countersunk into the topliofthefw'ork'talcle '9"'s`o as not-itc interfere with the :sand :beltpassi-ngfthereon. The work table 49 may.therefore be adjusted firrtherl`forward or backward b'y loosening f the nutsi12 on thevbolts"andsliding :the table 9 andthe bolts 10i into tlrevsaid'desiredposition. As-seen'inFiglS, the-work'table 9 is providedi with a sbroad` shallow: notch; 13 -in itsy `fro-nt. edge,- tlie part 14 forming;the rrear shown in 4f Also" af correspondingly positioned notch 15? isfforneed in thel rear asoroad ias the 'notch 13 ybt' isvniuch deeper andonlyleavesa narrowpartl ofthe tabl-'e 9` r between` it `and the 'notch#13s The upper rearedge 17 of'the part" 16"'is' roundedfas desiredf T wolateral fclits vor' slots. I18 'eXtend freni-the twoinnerfcorners ofthenotcli115, parallel with lthe' front edge 4' ofv the? table 9,theffrontsides offftlreisaid: cuts '18' beingi'a continuation Aof Vtherear: edge 17.of the vpart 16,':1 and are roundedto 'makel a"gradualchange? ofi shape- 'from :thelevel of' the work table" 9 lto ltherounded part 17 The sand belt 19y travels on topi of" theA workftable 9over the part `161fthereof,' and'inay. extend slightly .overtli'erounded part' 17 'as shown in'Fig; 4.' The particular 'dimensions -offthe l part 1G yand its curved part '1T-'depends AVon the work to be donein the machin@7 different tables :being provided for differenti parts tobesnro'othed.

A collar orosocketfQO issecured tothe base table 1V at a pointv towardstherear and to one side of the notch 3 therein. AKV column 21 isadjustably securedin vertical position in the collar 20, being held inadjusted position bythe set screw 22. The column 21 may thereforebeVadjusted either vertically Y or angularly about the axis thereof. The

column carries, at its upper end, a head 23,

Y through which the horizontal bar 24 passes,

therein byitheset screw 25.

and this 4bar is `held in adjusted position t The bar 24 extends towardsthe front and its front end is offset, as at 26, towards the notches 2and Y 3. The frontend of the bar carries Vthe work brace board 27Therefore, bymeans of the setrrscrew 22 the brace lboard 27 may be ad-'i VYj-,usted -in vertical height and in horizontal AFig.-1, having aVstraight horizontal lower edge 28.heldabove the part 16 of the workv'table to permitthe sand belt 19 to pass be- Y Y. tween tlieparts 16 and28 (Fig. 4). Also a Vdownward extending Vlob/e 29 projects Asharply.from the front end of the straight part 28 and anl opposite lobe 30extends-upward Yfrom the rear'end of the said straight Vpartf28; Theupper edge ofthe board 27 is curved to make a convenient shape to brace.the part beingv smoothed and to permit the operators left arm to passover it when the l"part thereof being held by 'thevleft `hand is :in orVnear the rear notch 3' in the base table V1. The brace board 27Y isadjusted', asrabove describedyin' order toV bring it into thedesiredposition relatively tothe traveling sand belt 19. Normally, ofcourse, this position fis iatright angles to the belt'but in certain,

icasesthe smoothed surface makes a different Langel with the adjacentsurface and in such 'cases the brace board must be adjusted. to

bring it tothe desired new position. Y

- VThe sand belt 19 usedV in this machine may Ybei of any desiredzwidthbut in practice I Vuse' narrow belts, ffroni 2i/8 inch wide to 4 inchesfwide, jacoording to Ythe particular needs ofthe pieces being smoothed.As seen 'in Figlr vthe sand belt 19.is mounted on the two .wlieels 31`and 32. 'The wheel 32 is driven by any suitable means as by the driveVbelt 33 Vand draws the sand belt- 19 through the-machine in such manneras to drag the vpiece being smoothed against theV working fsurface ofthe brace board 27.

i ',My improved scroll sanding machine yis Voperated briefly inthe'following nianne'rr'- It is,- of course,'understood that the machineis Vintendedforiise in a factory where a large number of exactly similarrpieces are to be smoothed in a lot. The proper work vtable 9, and belt19 are therefore selected for the lot to be worked on, and the table andbrace board are adjusted to suit the work tobe done. This lot usuallyconsists of pieces from l@ inch to 6 inches in thickness, such as chairback top rails, chair back banisters, buffet toilet frames, withdillerently shaped ornaments, and other similar parts. When the partsare very thin a number of them may be temporarily secured together inproper alignment and all smoothed together at the same time, thusreducing the time and the cost of production further. As indicated inFig. 1, the outline of these pieces comprises straight portions combinedwith concave and convex portions. When the straight portion is to besmoothed it is held firmly down on that part of the sand belt travelingon the flat surface of the part 16 and is held against the brace board27, the straight edge 28 of which engages the lower .edge ofthe portionbeing smoothed adjacent to the sanding belt, and keeps it steady andstraight while the belt is acting on it; similarly when the portion tobe smoothed is rounded or convex in outline, the sharp corner at thebeginning of the convex portion is irst placed at the edge of the belt,the shape of the undercut part 14 of the table` 16 permitting the beltto enter into the extreme corner, and then the portion is rolled on thebelt (Fig. 1, dotted lines) being held rmly down thereon and thus thesaid convex part is smoothed. However, when the part to be smoothed isconcave in profile, it is placed with the said concave portion pressingthe rear edge of the sand belt 19 down over the rounded part 17 of thetable Y16 Fig. 4) the belt gradually bending down to t ie required shapealong the cut 18. Thus -it will be seen that a scroll of any outline maybe smoothed in this machine by Amanipulating it to bring its varioussurfaces successively on to the sanding belt, and that the brace boardwill steady it and will guide it so that it will not be forced out ofthe cor- Y rect angle by the pull of the sand belt on the surface.

Having described my invention, what I claim is 1. In a scroll sandingmachine, the combination of a traveling sand belt, having its abrasivesurface upward; a work table whereon said belt travels,'said table beingnotched in its front and rear edges to permit the portions of the scrollpiece not being `sanded to swing beyond the plane of the sand belt andthus permit the portion being sanded to be rolled on the said sand belt;and a work brace board supported over the traveling sand belt andadapted to brace and to guide the scroll piece held thereagainst andpressed on the sand belt.

2. An apparatus as set forth in claim 1,

wherein the work table is adjustable relatively to the path of the belt,whereby the edge of the table is brought to the edge of said belt.

3. An apparatus as set forth in'claim l, wherein the work table isnotched in its front edge and is undercut to permit the scroll piece tobe placed with the edge of the belt entering a reentrant scroll corner.l

4. An apparatus as set forth in claim l, wherein the work table isnotched in its rear edge and the upper corner thus formed is rounded topermit the sand belt to be bent down thereover to smooth a concaveportion of the scroll.

5. An apparatus as set forth in claim l, wherein the Work table isnotched in its rear edge and is provided with slot extensions to saidnotched part, the upper corner thus formed being rounded to permit thesand belt to be bent down thereover to smooth a concave portion of thescroll.

6. An apparatus as set forth in claim l, wherein the work brace boardcomprises a loW horizontal section positioned over the work table andseparated therefrom by a space for the traveling sand belt, togetherwith a downward extending front lobe and an upward extending rear lobe.p

Signed at Tacoma, Wash., this 2nd day of August, 1922.

EMIL F. BUTTS.

